Operation method of low intensity supersonic waves for strengthening treatment effect of continuous flow biological reaction tank

The invention relates to an operation method of low intensity supersonic waves for strengthening the treatment effect of a continuous flow biological reaction tank. A supersonic generator is arranged at a return sludge pump well of a municipal sewage plant; a part of return sludge is treated by supersonic waves intermittently for a plurality of times or is treated by the supersonic waves continuously for two times; and the sludge needing to be treated by supersonic waves returns to the biological reaction tank together with the sludge being and without being radiated and treated by the supersonic waves. The low intensity supersonic waves improve the capacity for treating swage by improving the activity of microbes in activated sludge in a biological treatment system, and further effectively improve the quality of water after being treated.